Hertz

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The hertz or hertz (symbol Hz) is the unit of frequency of the International System of Units.

Definition

Named after the German physicist Heinrich Rudolf Hertz (1857-1894), who discovered the propagation of electromagnetic waves. The name was established by the International Electrotechnical Commission (IEC) in 1930. This was adopted in 1960 by the CGPM (Conférence Générale des Poids et Mesures: General Conference on Weights and Measures), replacing the previous name of cps (cycles per second), as well as their related multiples:

kc/s (kilocicles per second),
Mc/s (megacycles per second), and
Gc/s (gigacycle per second).

The term cycle per second was completely replaced by hertz in the 1970s. It is also used in sine curves, which represent sound waves.

One hertz represents one cycle per second, understanding cycle as the repetition of an event. For example, the hertz is applied in physics to the measurement of the number of times per second that a wave (whether sound or electromagnetic) is repeated or it can also be applied, among other uses, to sea waves that reach the beach per second or to the vibrations of a solid. The magnitude that the hertz measures is called frequency and is, in this sense, the inverse of the period. One hertz is the frequency of an oscillation that a particle undergoes in a period of one second.

${displaystyle f={frac {1}{T}}=mathrm {Hz=s^{-1}={frac {1}{s}}} }$

The conversion between a frequency $f$ measured in hertz and angular speed $omega$ radian measurement per second is

{displaystyle omega =2pi f,}

and

{displaystyle f={frac {omega }{2pi }},}

A sinusoidal wave with variable frequency of 1 to 5 hertz.

Multiples of Hertz

The following is a table of the multiples and submultiples of the SI (International System of Units).

Multiple International Hertz System (Hz)
Value	Symbol	Name	Value	Symbol	Name
Submultiplos			Multiple
10⁻¹ Hz	dHz	decihertz	10¹ Hz	daHz	decahercio
10⁻² Hz	cHz	centihertz	10² Hz	hHz	hectohertz
10⁻³ Hz	mHz	millihertz	10³ Hz	kHz	kilohertz
10⁻⁶ Hz	μHz	microhertz	10⁶ Hz	MHz	megahertz
10⁻⁹ Hz	nHz	nanohertz	10⁹ Hz	GHz	gigahertz
10⁻¹² Hz	pHz	picohercio	10¹² Hz	THz	terahercio
10⁻¹⁵ Hz	fHz	femtohercio	10¹⁵ Hz	PHz	petahercio
10⁻¹⁸ Hz	aHz	Attohertz	10¹⁸ Hz	EHz	exahertz
10⁻²¹ Hz	z	zeptohertz	10²¹ Hz	ZHz	zettahercio
10⁻²⁴ Hz	and Hz	Ictohercio	10²⁴ Hz	YHz	Yottahercio
10⁻²⁷ Hz	rHz	redhearted	10²⁷ Hz	RHz	ronnahercio
10⁻³⁰ Hz	qHz	Quectohercio	10³⁰ Hz	QHz	quettahercio
The most common prefixes are in bold.

This unity of the International System is named in honor of Heinrich Rudolf Hertz. In the units of the SI whose name comes from a person's own name, the first letter of the symbol is written with capital (Hz), while his name always starts with a tiny letter (hertz), except in case you start a sentence or a title.
Based on The International System of UnitsSection 5.2.

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